High Distortion on Aleph 5 - Page 2 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 13th March 2007, 07:09 PM   #11
diyAudio Member
 
wuffwaff's Avatar
 
Join Date: Aug 2001
Location: Ingolstadt Germany
Hi,

I don´t want to confuse you but here´s another method:

1. Set the output to something like a 5-10V sinus (8 or 4 ohms)

2. Measure the voltage over each current source fet´s source resistors

3. add all of the voltages and devide by the source resistor value. Now you´ve got the current from the current source

4. measure the voltage over the output resistors and devide by their combined value. Now you´ve got the total output current

5. Devide the C.S. current by the total current et voilà the AC-Current-Gain

William
__________________
een ooievaar is geen konijn want zijn oren zijn te klein!
  Reply With Quote
Old 1st June 2007, 11:48 AM   #12
Jaac is offline Jaac  Netherlands
diyAudio Member
 
Jaac's Avatar
 
Join Date: Oct 2002
Location: Amsterdam
Blog Entries: 1
Oke did some testing yesterday with the R21. The AC current gain is set properly. The dc bias is almost 2 amps total. With +/- 40V rail i could pull out something about 23,5 Vrms into 8 ohm thus 69 Watt with THD+N under 0,1%.

I also completed the other channel ! But I measured some 50/100 Hz noise from the mains i think on the output.
We have checked the powersupplyconnections with a old tek scope with differential input at the connection between the rectifier diodes and the big caps and measured those nice diode currents voltage drops over these connections. I'll check these next week after i connected these amps to my system !!!

Thanks Nelson and Jaap Pees ( for his test bench and knowledge ) and the others for pointing me in the right direction. Will email you my project for the diypass website soon.

gr Jaac
__________________
The right tool for the right job, a very nice Solarboat || Ready for a groupbuy ? CLick
  Reply With Quote
Old 2nd June 2007, 02:29 AM   #13
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Nothing more gratifying than progress.

  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Aleph (Single Ended) + Larvadin (no Memory Distortion) = Ultimate Aleph? tiefbassuebertr Pass Labs 19 25th January 2014 02:15 AM
high frequency distortion paul_peraic Parts 2 7th May 2008 03:48 PM
Turntable High Frequency Distortion Sibilance Signal Analogue Source 1 8th January 2008 06:09 PM
Low Distortion High Dynamic Range Pre-amp Nico Ras Pass Labs 64 18th May 2007 05:26 AM
Is there a no/gain preamplifier schematic using high-distortion EC90? Layberinthius Tubes / Valves 6 10th May 2004 06:13 AM


New To Site? Need Help?

All times are GMT. The time now is 07:01 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2